CAJ | 학술논문

影响电站凝汽器换热的因素有多种，研究这些影响因素有利于提高凝汽器换热性能。建立凝汽器壳侧流体流动与换热带有多孔介质概念的准三维数值模型，使用数值模型模拟实验凝汽器内部换热特性。在实验中，考虑冷却水入口质量流量、入口温度、蒸汽负荷、漏空气量对换热特性的影响；同样研究了湍流黏度、网格数对计算结果的影响。凝汽器入口参数直接影响凝汽器换热特性，漏空气量增大传热热阻，增大传热端差，降低传热系数；湍流黏度取值不同对数值结果有一定的影响；网格数对凝汽器实时仿真影响很大。
영향전참응기기환열적인소유다충，연구저사영향인소유리우제고응기기환열성능。건립응기기각측류체류동여환열대유다공개질개념적준삼유수치모형，사용수치모형모의실험응기기내부환열특성。재실험중，고필냉각수입구질량류량、입구온도、증기부하、루공기량대환열특성적영향；동양연구료단류점도、망격수대계산결과적영향。응기기입구삼수직접영향응기기환열특성，루공기량증대전열열조，증대전열단차，강저전열계수；단류점도취치불동대수치결과유일정적영향；망격수대응기기실시방진영향흔대。
There are some factors influencing the heat transfer in the shell side of power plant condensers. It is very important to study the factors for improving condensers’heat transfer characteristics. A quasi-three-dimensional method with porous medium was developed to simulate the flow field and heat transfer in the shell side of condensers, then the model was used to simulate internal heat transfer characteristics of condenser by experiment. The inlet cooling water mass flow and temperature, inlet steam mass flow, and inlet air mass fraction were considered influencing the heat transfer. The turbulent viscosity and grids number were also taken into account for the numerical results. Inlet parameters can directly influence the heat transfer. Inlet air mass fraction increases the heat transfer resistance and the temperature difference, decreases the heat transfer coefficient. Different selection of the value of turbulent viscosity will lead to different numerical results. The number of grids has great influence on the real-time simulation.